JP2988793B2 - Optical equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical apparatus having a movable lens in an optical system, and more particularly to an optical apparatus such as a camera and an observation apparatus.

[0002]

2. Description of the Related Art Conventionally, in optical devices such as cameras,
Detects the temperature of the device and corrects the optical system stop position, movement amount, and movement speed for autofocus and zoom, and positively determines the stop position, movement amount, and movement speed of the optical system based on the detected temperature. I did not change. This is because the focal length of the conventional optical system did not greatly change due to a temperature change.

[0003]

However, in recent years,
2. Description of the Related Art In a photographing device such as a camera, the size of a photographing optical system is being reduced. And the blurring of the image on the expected image plane due to the deviation of the image forming position and the error of the position detection of the moving optical system is so large that it cannot be ignored.

Further, with the miniaturization of the image sensor and the increase in the pixel density, there is a problem that the blurring of the image becomes more conspicuous even if the amount of deviation of the image forming position of the photographing optical system is the same as that of the conventional camera. Was.

An object of the present invention is to solve the above problems,
An object of the present invention is to provide an optical device such as a camera or an observation device that can obtain a high-quality image with a small blur of an image formed by a photographing optical system on a predetermined image forming plane.

[0006]

Means for Solving the Problems To achieve the above object,
For this purpose, the optical apparatus of the first invention of the present application has a moving lens.
Optical system and lens driving means for driving the moving lens
And a lens drive for performing drive control of the moving lens
Environmental information such as temperature and humidity as parameters
Storage means for storing and storing the environment variables
Variable detection means, and
Stored in the storage meanslensSelect drive control information
Based on the information selected by the selecting means.
Drive control means for driving the lens drive means
In addition to the above, the environmental variable
The information of the storage means is selected by the output of the detection means,
The lens drive control means based on the
Driving the lens driving means for further operation of the operating means
Start shooting. In the second invention of the present application,
A first optical system for changing the,Zoom and zoom
A second optical system for focusing adjustment;Has, The first light
To compensate for changes in focus due to the movement of academic systemsToThe said
Optics that drives the optical system 2machineIn the first light
Depending on the position of the schoolWasMoving direction and speed of the second optical system
Information to determine environmental parameters such as temperature and humidity.
Storage means for storing parameters as parameters,
Environmental variable detecting means for detecting, and output of the environmental variable detecting means.
Select the information stored in the storage means according to the force
Selecting means for selecting the information selected by the selecting means.
The second optical system is driven based on the second optical system. Further, the present application
According to the third aspect, the first optical system for changing the zoom state is used.
System,A second optical system for adjusting zoom and focus;To
PossessThe change in focus due to the movement of the first optical system.
To correctToOptics for driving the second optical systemmachineIn
And The second optical system according to the position of the first optical system
Information to determine the direction and speed of the systemAnd temperature and
Such as humidityEnvironment variables and parametersAnd the environment variables area
A reference ring for each environment variable area set multiple by division
Environment variable valuesStorage means for storing the correction information;
Environment variable detection means for detecting the environment variable,
Information and information for determining the moving direction and speed of the second optical system
Information selected according to the output of the
The second optical system is driven based on.

[0007]

Therefore, the speed and position of the moving lens in the optical device are controlled in accordance with the environmental variable (temperature) in which the optical device is used, so that a clear image without blur can always be realized.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

<First Embodiment> FIG. 1 is a schematic configuration diagram of a camera and a lens according to a first embodiment of the present invention, FIG. 2 is a block diagram showing a circuit configuration of the first embodiment of the present invention, and FIG. 4 is a flowchart for controlling operations of a camera and a lens according to the first embodiment of the present invention.

A is a lens unit, and B is a camera body unit. Reference numeral 1 denotes a photographing optical system, 1a denotes a focusing lens, 1b denotes a zoom lens, and 1c denotes a fixed lens. Reference numeral 2 denotes a holding barrel that holds the focusing lens 1a, and has a gear portion 2a. Reference numeral 3 denotes a fixed portion, which is screwed with the holding barrel 2. Reference numeral 4 denotes a focus motor for rotating the holding barrel 2. Reference numeral 4a denotes a gear of the motor output shaft, which is engaged with the gear 2a of the holding barrel 2. Reference numeral 5 denotes an aperture unit, 6 denotes a lens contact, 7 denotes a lens mount, and 8 denotes an optical axis of a photographing optical system. 9 is a quick return mirror having a half mirror portion. 10 is a submirror attached to the quick return mirror,
11 is a shutter unit, 12 is a pentaprism, 1
Reference numeral 3 denotes a finder lens, 14 denotes an imaging surface, 15 denotes a camera contact point, 16 denotes a camera mount that can be connected to the lens mount 7, 17 denotes an AF sensor unit, 18 denotes an AE sensor unit having a photoelectric conversion element, and 19 denotes a quick return mirror drive. Motor. Reference numeral 20 denotes a temperature sensor that detects the temperature of the lens unit A. The lens unit A includes a lens control circuit electrically connected to the focus motor 4, the aperture unit 5, the lens contact 6, and the temperature sensor 20, and a lens position control information storage circuit electrically connected to the lens control circuit. And

The camera unit B has a camera control circuit and a power supply electrically connected to the camera control circuit. The camera control circuit includes a shutter unit 11, a camera contact 15, an AF sensor unit 17, and an AE sensor unit 18. , And the motor 19. The lens control circuit and the camera control circuit are electrically connected via the lens contact 6 and the camera contact 15.

Next, the operation will be described.

When the power switch of the camera (not shown) is operated to turn on the power, the aperture unit 5 is opened. Then, when the photographer decides the composition and the release button (not shown) is pressed for half of the stroke, the switch 1 in FIG. 2 is turned on. When this is detected by the camera control circuit, the lens unit is detected by the temperature sensor 20. The temperature of A is detected, and drive information (drive speed, drive amount) of the focusing lens 1a in each temperature region.
The lens driving condition of the temperature detected by the temperature sensor 20 is detected from the lens position control information storage circuit that stores.

Further, the brightness of the subject is measured by an AE sensor unit 18 having a photoelectric conversion element, and the light is reflected by a sub-mirror 10 after passing through a half mirror portion of a quick return mirror 9 to be reflected by an AF sensor unit 17 having a photoelectric conversion element. Then, the amount of movement of the focusing lens 1a for focusing based on the previous lens driving conditions is detected, and the power supply voltage is checked. Then, the shutter speed, the aperture value, and the moving amount of the focusing lens 1a are determined. Since the holding lens barrel 2 and the fixed part 3 are screwed together, when the rotation of the focusing motor 4 is transmitted to the holding lens barrel 2 via the gears 4a and the gear part 2a, the focusing lens 1a rotates and emits light. Move in the axial direction. Then, the focus motor 4 is rotated by the determined movement amount of the focus lens 1a to move the focus lens 1a to the in-focus position, and the auto focus is performed.

In this state, when the release button is further depressed, the switch in FIG. 2 is turned on. When this is detected by the camera control circuit, the aperture unit 5 is changed to the determined aperture value, and the quick return mirror is changed. 9 is retracted out of the light beam (the position indicated by the broken line in FIG. 1). Then, the shutter unit 11 is opened and closed according to the determined value of the shutter speed, and the imaging surface (film surface) 1 is opened.
4 is exposed. Then, the quick return mirror 9 is returned to the original position, the aperture unit 5 is returned to the open state, the film is fed by one frame, and the photographing operation ends.

As described above, if the movement control of the focusing lens 1a (moving lens) is performed based on the temperature of the lens unit A or the camera unit B, highly accurate focus control can be performed. The drive information stored in the lens position control information storage circuit may be information such as the focal length and refractive index of the focusing lens 1a or the like, instead of the drive speed and the drive amount, or may be all of these information.

<Second Embodiment> Next, a second embodiment of the present invention will be described with reference to FIGS.

FIG. 4 is a schematic configuration diagram of a camera and a lens according to a second embodiment of the present invention, FIG. 5 is a block diagram showing a circuit configuration of the second embodiment of the present invention, and FIG. 6 is a second embodiment of the present invention. 6 is a flowchart for controlling the operation of the example camera and lens.

In FIG. 4, C is a lens unit, and D is a camera body unit. 31 is a photographing optical system, 31
a is a focus lens, 31b is a zoom lens, 3
1c is a fixed lens. 32 is a focusing lens 3
This is a holding barrel that holds 1a, and has a gear portion 32a. 33 is a fixed part, which is screwed with the holding lens barrel 32. Reference numeral 34 denotes a power transmission shaft for transmitting a movement for rotating the holding barrel 32, and includes a gear part 34a that engages with a gear part 32a of the holding barrel 32, and a joint part 34b. Reference numeral 35 denotes an aperture unit, 36 denotes a lens contact, 37 denotes a lens mount, and 38 denotes an optical axis of a photographing optical system. A quick return mirror 39 has a half mirror portion. 40 is a submirror attached to the quick return mirror, 41 is a shutter unit, 42 is a pentaprism, 43 is a finder lens, 44 is an imaging surface,
45 is a camera contact, 46 is a camera mount that can be connected to the lens mount 37, 47 is an AF sensor unit,
8 is an AE sensor unit having a photoelectric conversion element, 49
Is a motor for driving a quick return mirror. 50
Is a focus motor for rotating the holding barrel 32 provided in the camera body unit D. 50a is a motor output shaft gear. Reference numeral 51 denotes a shaft for transmitting the power of the motor 50 to the power transmission shaft 34. The shaft 51 includes a gear portion 51a that engages with the gear 50a, and a joint portion 34b.
And a joint portion 51b that engages with A temperature sensor 52 detects the temperature of the lens unit C. The lens unit C includes an aperture unit 35, a lens contact 36,
A lens control circuit electrically connected to the temperature sensor 52;
A lens position control information storage circuit electrically connected to the lens control circuit;

The camera body unit D has a camera control circuit and a power supply electrically connected to the camera control circuit. The camera control circuit includes a shutter unit 41,
The camera contact 45, the AF sensor unit 47, the AE sensor unit 48, the motor 49, and the focus motor 50 are electrically connected. The lens control circuit and the camera control circuit include a lens contact 36 and a camera contact 45.
Are electrically connected via

Next, the operation will be described.

When the power switch of the camera (not shown) is operated to turn on the power, the aperture unit 35 is opened. When the photographer decides the composition and the release button (not shown) is pressed for half of the stroke, the switch 1 in FIG. 5 is turned on. When this is detected by the camera control circuit, the lens is detected by the temperature sensor 52. The temperature of the unit C is detected, and the lens position control information storage circuit that stores the drive information (drive speed and drive amount) of the focus lens 31a in each temperature region is used.
The lens driving condition at the temperature detected by the temperature sensor 52 is detected.

Further, the brightness of the subject is measured by the AE sensor unit 48 having the photoelectric conversion element, and the light having passed through the half mirror portion of the quick return mirror 39 and reflected by the sub-mirror 40 is used to measure the brightness of the A having the photoelectric conversion element.
The F sensor unit 47 detects the amount of movement of the focusing lens 31a for focusing based on the previous lens driving conditions, and checks the power supply voltage. Then, the shutter speed, the aperture value, and the moving amount of the focusing lens 31a are determined. Holding barrel 32 and fixed part 3
3 is screwed, the rotation of the focusing motor 50 is held via the gear 34a, the gear portion 32a, the power transmission shaft 34, the joint portion 34b, the shaft 51, the gear 50, the gear portion 51a, and the joint portion 51b. 32, the focus lens 31a moves in the optical axis direction while rotating. Then, the focusing motor 50 is rotated based on the determined moving amount of the focusing lens 31a, and the focusing lens 31a is moved to the in-focus position to perform autofocus.

In this state, when the release button is further depressed, the switch shown in FIG. 5 is turned on. When this is detected by the camera control circuit, the aperture unit 35 is turned on.
Is changed to the determined aperture value, and the quick return mirror 39 is retracted out of the light flux (the position shown by the broken line in FIG. 4). Then, the shutter unit 41 is opened and closed according to the determined value of the shutter speed, and the imaging surface (film surface) 44 is exposed. Then, the quick return mirror 39 is returned to the original position, the aperture unit 35 is returned to the open state, the film is fed by one frame, and the photographing operation ends.

As described above, the focusing lens 31a
If the movement control of the (moving lens) is performed based on the temperature of the lens unit C or the camera unit D, highly accurate focus control can be performed. Further, the drive information stored in the lens position control information storage circuit may be information such as a focal length and a refractive index of the focusing lens 31a or the like instead of the drive speed and the drive amount, or all of these information. .

<Third Embodiment> FIG. 7 is a schematic configuration diagram of a camera according to a third embodiment of the present invention, FIG. 8 is a block diagram showing a circuit configuration of the third embodiment of the present invention, and FIG. 10 is a flowchart for controlling the operation of the camera according to the third embodiment of the present invention, FIG.
FIG. 11 is a map showing the relative positional relationship between two movable lenses for each subject distance, and FIG. 11 is a view obtained by dividing FIG.

In FIG. 7, reference numeral 61 denotes a photographing optical system and 61a
Denotes a first group fixed lens, 61b denotes a zoom V lens, 61c
Denotes a third group fixed lens, and 61d denotes a focus and zoom RR lens. Reference numeral 62 denotes a fixed unit which holds a first group fixed lens 61a and a third group fixed lens 61c. 63
Denotes a holding barrel for the V lens 61b, and a sleeve 63a.
Having. 64 is a holding barrel of the RR lens 61d,
It has a sleeve part 64a and a screw part 64b. A screw bar 65 has a groove having a fixed lead, is engaged with the sleeve portion 63a, and is rotatably held by the holding barrel 62. 66 is an optical axis, 67 is a holding barrel 63
A guide bar for regulating rotation in a plane perpendicular to the optical axis 66 of the
68 is a guide bar that engages with the sleeve portion 64a, and 69 is a guide bar that regulates rotation of the holding barrel 64 in a plane perpendicular to the optical axis 66. These three guide bars 67, 6
8 and 69 are held by the fixing portion 62. Reference numeral 70 denotes a ball which is pressed by the spring 71 from the holding barrel 63 into the groove of the screw bar 65, thereby positioning the V lens 61b. 72 is a screw bar 6
5, a motor 73 for moving the V lens 61b fixed to the fixing portion 62, and a motor 73
Are attached to the output shaft and are engaged with the gear 72. 75 is an RR lens 61 attached to the fixed part 62
This is a stepping motor for moving d, and the screw portion of the output shaft is screwed with the screw portion 64b. 76 is an aperture unit, 7
7, a temperature sensor; 78, a photoelectric conversion element such as a CCD;
9 is an electronic view finder, 80 is a finder lens, 81 is a camera power switch, 82 is a camera zoom operation switch, 83 is an encoder that detects the position of the holding barrel 63 to detect the position of the V lens 61b, A switch 84 detects the reference position of the RR lens 61d.

The camera has a camera control circuit, a recording unit electrically connected to the camera control circuit, and a power supply. Also, a motor 73, a step motor 75, an aperture unit 76, a temperature sensor 77, a photoelectric conversion element 7
8, electronic viewfinder 79, power switch 81,
The zoom operation switch 82, the encoder 83, and the switch 84 are electrically connected to the camera control circuit.

Next, the operation will be described.

When the power switch 81 of the camera is operated and the power is turned on, the step motor 75 is rotated,
The holding barrel 64 (that is, the RR lens 61d) screwed to the output shaft 75a of the step motor 75 is moved to the reference position. When the RR lens 61d reaches its reference position, the switch 84 is turned on, and the step motor 75
Turn off the power to the. Then, by counting the pulse current applied from the reference position to the step motor 75, the absolute position of the RR lens 61d can be detected. Further, the RR lens 61d is slightly vibrated in the optical axis direction, and the RR lens 61d is moved to a position where the high frequency component of the video signal of the photoelectric conversion element 78 is maximized, whereby the focusing operation is performed. The exposure amount is controlled by the photoelectric conversion element 78.
The aperture diameter of the aperture unit 76 is controlled by an aperture control circuit so that the amount of light incident on the aperture unit becomes constant.

The image from the photoelectric conversion element 78 is displayed on the electronic viewfinder 79 so that the photographer can observe it (this state is a standby state). The temperature of the photographing optical system 61 is measured by the temperature sensor 77. When the zoom operation switch 82 is operated, the V lens 61 is rotated by rotating the motor 73 and the step motor 75.
b and the RR lens 61d are moved in the optical axis direction. Here, when the motor 73 is rotated, the rotation of the motor 73 is transmitted to the screw bar 65 via the gear 73 and the gear 72,
The holding barrel 6 is inserted into the groove having the lead of the screw bar 65.
Since the ball 70 is pressed down from the position 3, the rotation of the screw bar 65 moves the V lens 61b in the optical axis direction. The position of the V lens 61b is detected by the encoder 83.

Next, the V lens 61b and the RR lens 61d
FIG. 1 shows the principle of the zoom operation performed by moving the lens in the optical axis direction.
This will be described with reference to FIG. The length (0.002 m, 0.4 m, 2 m, ∞) shown in FIG. 10 is the distance from the camera to the subject. Wide-angle (W) V lens 61b
If the RR lens 61d is not moved to the position shown in FIG. 10 due to each subject distance when the distance is changed from the distance to the telephoto (T), the focus will be out of focus. For this reason, when the V lens 61b is moved, the RR lens 61d is moved to the position shown in FIG.
It is necessary to move according to the map shown in. However, the map shown in FIG.
This shows a positional relationship between the lens 61b and the RR lens 61d. When a map of all object distances is stored and the RR lens 61d is moved according to the position of the V lens 61b, a huge amount of storage is required to store the map. Capacity is needed. By the way, the V lens 61b is moved at a constant speed in the T → W or W → T direction to divide the map of FIG. 10 into regions I, II... As shown in FIG. If the moving direction and moving speed of the RR lens 61d according to the moving direction and moving speed of the RR lens 61d are stored and this information is used to move the RR lens 61d by the movement of the V lens 61b, the map shown in FIG. can do. This method is disclosed in
This is known from, for example, Japanese Patent Application Publication No. 0709. However, when the use environment temperature of the camera changes, the lens barrel of the optical system 61 expands and contracts due to thermal expansion, and the distance between the lenses 61a, 61b, 61c, and 61d changes, and the refractive index of the lens changes, so that the lens first changes. The method described may be out of focus. for that reason,
In this embodiment, the operating temperature of the camera is divided into a plurality of parts, and the above-described map is set and stored in each temperature area. And, before the zoom operation, by the output of the temperature sensor 77,
The zoom operation is performed by selecting an appropriate temperature region map.

The zoom operation switch 82 is provided with a zoom switch 1 and a zoom switch 2. When the zoom switch 1 is turned on, the motor 73 rotates forward and the V lens 61b moves to the wide angle side, and the selected map is switched. R according to
The R lens 61d moves. When the zoom switch is turned on, the motor 73 rotates in the reverse direction, the V lens 61b moves to the telephoto side, and the RR lens 61d moves according to the selected map. The zoom switch 1 and the zoom switch 2 cannot be turned on at the same time.

When the photographer presses a photographing button (not shown), the photographing switch is turned on. When the camera control circuit confirms that the photographing switch is turned on, photographing is started, and the video signal by the photoelectric conversion element 78 is controlled by the camera. The data is transferred to a recording unit by a circuit, and is recorded on a recording medium by a recording unit control circuit. At this time, the focusing operation and the adjustment of the exposure amount described above have been performed, and the image is displayed on the electronic viewfinder 79. When the photographer releases the photographing button (not shown), the photographing switch is turned off. When the camera control circuit confirms that the photographing switch is turned off, the photographing operation is stopped, and the camera returns to the standby state.

In the first and second embodiments of the present invention described above, an interchangeable lens type camera has been described. However, the present invention is applied to a camera having a photographic optical system integrated like a video camera of the present embodiment. Can also be applied. In this case, a temperature sensor provided on the interchangeable lens side or a lens position control information storage circuit may be provided on the camera body side. Further, by providing a humidity sensor as well as a temperature sensor, a change in the refractive index of the imaging optical system due to humidity or the like may be corrected in the same manner as the temperature. Also, instead of storing the moving direction and moving speed of the lens in each temperature area ,
Similarly, after dividing the operating temperature of the lens into a plurality of the moving direction and moving speed information of the lens with respect to the reference temperature, it is stored and the correction information for the reference temperature of the temperature regions
Drive control of the lens may be performed.

<Fourth Embodiment> Next, a fourth embodiment of the present invention will be described with reference to FIGS. In addition,
In FIG. 12, the components denoted by the same reference numerals as those in FIG. 1 are the same as the components in the first embodiment.
A description of the same components as those of the embodiment will be omitted.

In the structure of this embodiment, an encoder 21 for detecting the position of the holding lens barrel 2 for detecting the position of the focusing lens 1a, and a lens for correcting the output of the encoder 21 based on the detection signal of the temperature sensor 20 The difference from the first embodiment is that the position information correction circuit 22 is provided in the lens unit A.

The operation of the camera of this embodiment will be described below with reference to FIGS.

When the power switch of the camera (not shown) is operated and the power is turned on, the aperture unit 5 is opened. When the photographer determines the composition and the release button (not shown) is pressed for half of the stroke, the switch 1 in FIG. 13 is turned on. When this is detected by the camera control circuit, the encoder 21 , The position of the focusing lens 1a is detected, and
The temperature of the lens unit A is detected by the temperature sensor 20. Then, in accordance with the temperature detected by the temperature sensor 20 by the lens position information correction circuit 22, the encoder 2
The position information of the focus lens 1a detected in step 1 is corrected, and the corrected position information is transmitted to the camera control circuit through the lens control circuit. At the same time, a lens position control information storage circuit that stores drive information (drive speed, drive amount) of the focusing lens 1a,
The lens driving conditions are derived by the lens control circuit.

Further, the brightness of the subject is measured by the AE sensor unit 18 having the photoelectric conversion element, and the light passing through the half mirror portion of the quick return mirror 9 and reflected by the sub mirror 10 is used by the AF sensor unit 17 having the photoelectric conversion element. Then, the amount of movement of the focusing lens 1a for focusing based on the previous lens driving conditions is detected, and the power supply voltage is checked. Then, the shutter speed, the aperture value, and the moving amount of the focusing lens 1a are determined. Since the holding lens barrel 2 and the fixed part 3 are screwed together, when the rotation of the focusing motor 4 is transmitted to the holding lens barrel 2 via the gears 4a and the gear part 2a, the focusing lens 1a rotates and emits light. Move in the axial direction. Then, according to the determined moving amount of the focusing lens 1a, the focusing motor 4 is rotated to move the focusing lens 1a to the in-focus position, and the auto focus is performed.

In this state, when the release button is further depressed, the switch in FIG. 13 is turned on. When this is detected by the camera control circuit, the aperture unit 5
Is changed to the determined aperture value, and the quick return mirror 9 is retracted out of the light flux (the position shown by the broken line in FIG. 12). Then, the shutter unit 11 is opened and closed according to the determined value of the shutter speed, and the imaging surface (film surface) 14 is exposed. Then, the quick return mirror 9 is returned to the original position, the aperture unit 5 is returned to the open state, the film is fed by one frame, and the photographing operation ends.

As described above, if the movement control of the focusing lens 1a (moving lens) is performed based on the temperature of the lens unit A and the camera unit B, highly accurate focus control can be performed. The drive information stored in the lens position control information storage circuit is not the drive speed or the drive amount, but may be information such as the focal length or refractive index of the focusing lens 1a or the like, or may be all of these information. .
Further, the lens position information correction circuit 22 may be formed integrally with the lens control circuit.

<Fifth Embodiment> FIG. 15 is a schematic structural view of a camera according to a fifth embodiment of the present invention, and FIG.
FIG. 17 is a block diagram showing a circuit configuration of the embodiment, FIG. 17 is a flowchart for controlling the operation of the camera of the fifth embodiment of the present invention,
FIG. 18 is a map that displays the relative positional relationship between the two movable lenses for each subject distance, and FIG. 19 is a view obtained by dividing FIG. 18.

In FIG. 15, reference numeral 61 denotes a photographing optical system;
a is a first group fixed lens, 61b is a zoom V lens, 61
c is a fixed third lens, and 61d is a focus and zoom RR lens. Reference numeral 62 denotes a fixed unit which holds a first group fixed lens 61a and a third group fixed lens 61c. 6
Reference numeral 3 denotes a holding barrel for the V lens 61b, and a sleeve 63
a. Reference numeral 64 denotes a holding barrel for the RR lens 61d, which has a sleeve portion 64a and a screw portion 64b. 6
Reference numeral 5 denotes a screw bar, which has a groove having a fixed lead, is engaged with the sleeve 63a, and is rotatably held by the holding barrel 62. 66 is the optical axis, 67 is the holding barrel 6
A guide bar 68 for restricting rotation in a plane perpendicular to the optical axis 66, a guide bar 68 for engaging with the sleeve portion 64a;
Reference numeral 9 denotes a guide bar that regulates rotation of the holding barrel 64 in a plane perpendicular to the optical axis 66. These three guide bars 67,
68 and 69 are held by the fixing portion 62. Reference numeral 70 denotes a ball which is pressed by the spring 71 from the holding barrel 63 into the groove of the screw bar 65, thereby positioning the V lens 61b. 72 is a gear attached to the screw bar 65, 73 is a motor for moving the V lens 61b fixed to the fixing part 62, 74 is a motor 7
3 is a gear attached to the output shaft and engaged with the gear 72. 75 is an RR lens 61 attached to the fixed part 62
This is a stepping motor for moving d, and the screw portion of the output shaft is screwed with the screw portion 64b. 76 is an aperture unit, 7
7, a temperature sensor; 78, a photoelectric conversion element such as a CCD;
9 is an electronic viewfinder, 80 is a finder lens, 81 is a camera power switch, 82 is a camera zoom operation switch, 83 is an encoder that detects the position of the holding lens barrel 63 to detect the position of the V lens 61b, A switch 84 detects the reference position of the RR lens 61d.

Also, the camera includes a camera control circuit, a recording unit electrically connected to the camera control circuit, a power supply,
It has a lens position information correction circuit.

Further, a motor 73, an aperture unit 76,
A photoelectric conversion element 78, an electronic viewfinder 79, a power switch 81, and a zoom operation switch 82 are electrically connected to a camera control circuit. Step motor 7
5, temperature sensor 77, encoder 83, switch 8
4 is electrically connected to the lens position information correction circuit.

Next, the operation will be described.

When the power switch 81 of the camera is operated and the power is turned on, the step motor 75 is rotated, and the holding barrel 64 (that is, the RR lens 61d) screwed to the output shaft 75a of the step motor 75 is used as a reference. Move to position. When the RR lens 61d reaches the reference position, the switch 84 is turned on, and the power supply to the step motor 75 is stopped there. The absolute position of the RR lens 61d can be detected by counting the pulse current applied to the step motor from the reference position. Also, the RR lens 61d is slightly vibrated in the optical axis direction,
The RR lens 61d is moved to a position where the high-frequency component of the video signal of the photoelectric conversion element 78 is maximized, whereby the focusing operation is performed. In controlling the exposure, the aperture control circuit controls the aperture of the aperture unit 76 so that the amount of light incident on the photoelectric conversion element 78 is constant.

The image from the photoelectric conversion element 78 is displayed on the electronic viewfinder 79 so that the photographer can observe it (this state is a standby state). The temperature of the photographing optical system 61 is measured by the temperature sensor 77. When the zoom operation switch 82 is operated, the motor 73 and the step motor 75 are rotated so that the V lens 6
1b and the RR lens 61d are moved in the optical axis direction. Here, when the motor 73 is rotated, the rotation of the motor 73 is transmitted to the screw bar 65 via the gear 73 and the gear 72, and the ball 70 is pressed by the holding barrel 63 into the groove having the lead of the screw bar 65. Therefore, the rotation of the screw bar 65 causes the V lens 61b to move in the optical axis direction. In addition, according to the temperature detected by the temperature sensor 77, the V detected by the encoder 83
The position of the lens 61b is corrected by the lens position information correction circuit.

Next, the V lens 61b and the RR lens 61d
FIG. 1 shows the principle of the zoom operation performed by moving the lens in the optical axis direction.
8 and FIG. The length (0.002 m, 0.4 m, 2 m, ∞) shown in FIG. 18 is the distance from the camera to the subject. When the V lens 61b is changed from the wide angle (W) to the telephoto (T), the RR lens 61d will be out of focus due to each subject distance unless the RR lens 61d is moved to the position shown in FIG. Therefore, when the V lens 61b is moved, the RR lens 61d is moved to the position shown in FIG.
It is necessary to move according to the map shown in. However, the map shown in FIG.
This shows the positional relationship between the lens 61b and the RR lens 61d. When a map of all object distances is stored and the RR lens 61d is moved according to the position of the V lens 61b, an enormous amount of storage is required to store the map. Capacity is needed. By the way, the V lens 61b is moved at a constant speed in the direction of T → W or W → T, and as shown in FIG. 19, the map of FIG. 18 is divided into regions I, II,. The moving direction and the moving speed of the RR lens 61d according to the moving direction and the moving speed of the RR lens 61d are stored. If the RR lens 61d is moved by the movement of the V lens 61b based on this information, the map shown in FIG. can do. This method is disclosed in
This is known from, for example, Japanese Patent Application Publication No. 0709. However, when the ambient temperature of the camera changes, the lens barrel of the optical system 61 expands and contracts due to thermal expansion, the distance between the lenses 61a, 61b, 61c, and 61d changes, the refractive index of the lens changes, and the temperature changes. The output of the encoder 83 changes,
The above-mentioned method may be out of focus. For this reason, in the present embodiment, the operating temperature of the camera is divided into a plurality of parts, and the V
An appropriate correction amount of the position information of the lens 61b is set and stored. Then, before the zoom operation, an appropriate temperature region is selected based on the output of the temperature sensor 77, and information correction in this region is performed on the position information of the V lens 61b, and the V lens 61b and the RR lens 61d are shown in FIG. The map can be traced. Thus, the zoom operation is performed.

The zoom operation switch 82 is provided with a zoom switch 1 and a zoom switch 2. When the zoom switch 1 is turned on, the motor 73 rotates forward and the V lens 61b moves to the wide angle side, and the selected map is displayed. RR accordingly
The lens 61d moves. When the zoom switch is turned on, the motor 73 rotates in the reverse direction, the V lens 61b moves to the telephoto side, and the RR lens 61d moves according to the map. Note that the zoom switch 1 and the zoom switch 2 are simultaneously turned on.
I cannot do it.

When the photographer presses a photographing button (not shown), the photographing switch is turned on. When the camera control circuit confirms that the photographing switch is turned on, photographing is started, and the video signal by the photoelectric conversion element 78 is controlled by the camera. The data is transferred to a recording unit by a circuit, and is recorded on a recording medium by a recording unit control circuit. At this time, the focusing operation and the adjustment of the exposure amount described above have been performed, and the image is displayed on the electronic viewfinder 79. When the photographer releases the photographing button (not shown), the photographing switch is turned off. When the camera control circuit confirms that the photographing switch is turned off, the photographing operation is stopped and the camera returns to the standby state. Similarly,
The position information of the RR lens 61d may be corrected by the temperature detected by the temperature sensor 77.

[0053]

As described above, according to the first aspect of the present invention, by operating the operating member, the information in the storage means is selected in accordance with the output of the environment variable detecting means, and based on the selected information. Since the lens driving means is driven by the lens driving control means and shooting is started by further operation of the operating means, the lens can be driven even before starting shooting. For example, when employed in a single-lens reflex camera, a photographer can visually recognize a screen in which focus is accurately adjusted before photographing. According to the second and third aspects of the present invention,
The second according to the position of the first optical system taking into account environmental variables
The information for determining the moving direction and the speed of the optical system is stored in the storage means, or the second information corresponding to the position of the first optical system is stored .
Information and links to determine the direction and speed of movement of the optical system
Correction information for the reference environment variable value for each boundary variable area is stored in the storage means, and the second optical system is driven. It is possible to realize an optical device such as a camera that can reliably correct the movement and obtain a high-quality image.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a single-lens reflex camera which is a first embodiment of an optical apparatus according to the present invention.

FIG. 2 is a block diagram of a control system of the camera shown in FIG.

FIG. 3 is a flowchart of a control operation performed in the camera of FIG. 1;

FIG. 4 is a configuration diagram of a single-lens reflex camera which is a second embodiment of the optical apparatus of the present invention.

FIG. 5 is a block diagram of a control system of the camera shown in FIG.

6 is a flowchart of a control operation performed in the camera shown in FIG.

FIG. 7 is a configuration diagram of a video camera that is a third embodiment of the optical apparatus according to the present invention.

8 is a block diagram of a control system of the camera shown in FIG.

FIG. 9 is a flowchart of a control operation performed in the camera shown in FIG. 7;

10 is a map showing the relative positional relationship between two movable lenses of the camera shown in FIG. 7 for each subject.

FIG. 11 is a view obtained by dividing FIG. 10;

FIG. 12 is a configuration diagram of a single-lens reflex camera which is a fourth embodiment of the optical apparatus according to the present invention.

FIG. 13 is a block diagram of a control system of the camera shown in FIG.

FIG. 14 is a flowchart of a control operation performed in the camera shown in FIG.

FIG. 15 is a configuration diagram of a single-lens reflex camera which is a fifth embodiment of the optical apparatus according to the present invention.

16 is a block diagram of a control system of the camera shown in FIG.

FIG. 17 is a flowchart of a control operation performed in the camera shown in FIG.

18 is a map showing a relative positional relationship between two movable lenses of the camera shown in FIG. 15 for each subject.

FIG. 19 is a view obtained by dividing FIG. 18;

[Explanation of symbols]

1, 31, 61 ... photographing optical system 1a, 31a ...
Focusing lens 1b, 31b ... Zooming lens 1c, 31c ...
Fixed lens 2, 32 ... holding lens barrel 2a, 32a ...
Gear part 3,33 ... Fixed part 4,50 ... Focus motor 5,35 ... Aperture unit 3,36 ... Lens contact 7,37 ... Lens mount 9,39 ... Quick return mirror 10,40 ... Sub mirror 11,41 ... Shutter Units 12, 42 pentaprism 13, 43 finder lens 14, 44 imaging surface 15, 45 camera contact 16, 46 camera mount 17, 47 A
F sensor unit 18, 48 AE sensor unit 19, 49 Quick return mirror drive motor 20, 52 Temperature sensor 34b, 54b
... Joint part 21 ... Encoder 22 ... Lens position information correction circuit 61 ... Shooting optical system 61a ... One group fixed lens 61b ... Zoom V lens 61c ... Third group fixed lens 61d ... Focus and zoom RR lens 62 ... Fixed part 63, Reference numeral 64: holding barrel 63a: sleeve part 64: screw part 65: screw bar 67, 68, 6
9: Guide bar 70: Ball 71: Spring 73: V lens moving motor 74: Gear 75: RR lens moving step motor 76: Aperture unit 77: Temperature sensor 78: Photoelectric conversion element 79: Electronic viewfinder 80: Viewfinder lens 81: Power switch 82: Zoom operation switch 83: Encoder 84: Switch

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G02B 7/08 G02B 7/28-7/40 G03B 3/10 G03B 13/34

Claims (3)

(57) [Claims] 1. An optical system having a moving lens, lens driving means for driving the moving lens, and lens driving control information for controlling the driving of the moving lens using environmental variables such as temperature and humidity as parameters. Storage means for storing; environment variable detection means for detecting the environment variable; selection means for selecting lens drive control information stored in the storage means in accordance with an output of the environment variable detection means; And a lens drive control unit that drives the lens drive unit based on the information selected by the user.The operation of the operation member selects the information of the storage unit based on the output of the environment variable detection unit. An optical apparatus for driving the lens driving means by the lens driving control means on the basis of information and starting photographing by further operation of the operation means; vessel. 2. A first optical system for varying a zoom state and a second optical system of the zoom and focus adjustment titration,
Has the said second optical system have you <br/> an optical apparatus for driving a movement change of focus by the first optical system in order to correct, in accordance with the position of the first optical system Storage means for storing information for determining the moving direction and speed of the second optical system as parameters of environmental variables such as temperature and humidity; environmental variable detecting means for detecting the environmental variables; Selecting means for selecting information stored in the storage means in accordance with the output of the means, and driving the second optical system based on the information selected by the selecting means. Optical equipment. 3. A first optical system for changing a zoom state.
System,A second optical system for adjusting zoom and focus;To
PossessThe change in focus due to the movement of the first optical system.
To correctToOptics for driving the second optical systemmachineIn
And  Movement of the second optical system according to the position of the first optical system
Information for determining direction of movement and speedAnd temperature and humidity
ofEnvironment variables and parametersAnd to split the environment variables
More environment variables set as reference environment variables for each area
Against the valueStorage means for storing correction information; and environment variable detection means for detecting the environment variable, wherein information for determining the moving direction and speed of the second optical system is provided.
Selected according to the information and the output of the environment variable detection means
Driving the second optical system based on information
And optical equipment.